Fiso TPT-32

Power transformer temperature sensor

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Key Features
  • Withstands temperatures up to 225°C (437°F)
  • Double PTFE sheathing
  • Proven semiconductor optical absorption principle
  • EMI/RFI immune
  • Resists dielectric oil
  • Resists erosene vapor
  • High flexibility and visibility
  • Interchangeable
  • No calibration
  • Custom lengths from 1 to 15 metres
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Designed for power transformer or load cap changers

A fibre optic temperature sensor designed for power transformer or load tap changers temperature monitoring. Using optical absorption within a semiconductor (GaAs), it combines long-term reliability with high accuracy. Its flexible fiber optic cable and rugged PTFE exterior allow easy and safe installation in transformer windings & core, as well as in LTCs. Immune to RFI and EMI, the TPT-32 sensor can withstand harsh chemical environments.



Temperature range −40 to 225°C (−40 to 437°F)
Resolution 0.1°C
Accuracy ±2°C
Available sensor length 1 to 15 metres
Connector type ST connector
Fiber type 200 μm silica fi ber
Cable sheating Double PTFE sheathing (spiral wrap) with transversal slitting 0.9 mm PTFE cable*
3 mm PTFE spiral wrap cable*
Sensor dimensions 1.5mm O.D
Sensor certification Dielectric and kerosene vapor tests approved
Part number TPT-32
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